if (window.Event){
  document.captureEvents(Event.MOUSEUP);
}

function nocontextmenu()
{
 event.cancelBubble = true
 event.returnValue = false;

 return false;
}

function norightclick(e)
{
 if (window.Event)
 {
  if (e.which == 2 || e.which == 3)
   return false;
 }
 else
  if (event.button == 2 || event.button == 3)
  {
   event.cancelBubble = true
   event.returnValue = false;
   return false;
  }

}
document.oncontextmenu = nocontextmenu;  // for IE5+
document.onmousedown = norightclick;     // for all others
